4.6L V8 VIN 9 Auto 4

A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set. By using the purge solenoid command on a scan tool, vacuum can be applied to the system instead of pressure. With the EVAP canister vent solenoid valve open and the EVAP canister purge solenoid valve commanded to 100 percent, the vacuum should not increase to more than 9 inches H2O.

Ensure that the reference port on the FTP sensor is unobstructed.

Trouble Code: P0451

Fuel Tank Pressure (FTP) Sensor Performance

Possible Causes:

P0451 and P0454

A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set.

Ensure that the reference port on the FTP sensor is unobstructed.

An FTP sensor that is skewed or does not have a linear transition from low to high may cause this code to set. Scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use the Quick Snapshot and the Purge/Seal functions to capture data while commanding purge to 20 percent, then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 while taking a snapshot.

Trouble Code: P0452

Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

Trouble Code: P0452

Fuel Tank Pressure (FTP) Sensor Circuit Low Voltage

Possible Causes:

P0451 and P0454

A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set.

Ensure that the reference port on the FTP sensor is unobstructed.

An FTP sensor that is skewed or does not have a linear transition from low to high may cause this code to set. Scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use the Quick Snapshot and the Purge/Seal functions to capture data while commanding purge to 20 percent, then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 while taking a snapshot.

Trouble Code: P0453

Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

Trouble Code: P0453

Fuel Tank Pressure (FTP) Sensor Circuit High Voltage

Possible Causes:

P0451 and P0454

A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set.

Ensure that the reference port on the FTP sensor is unobstructed.

An FTP sensor that is skewed or does not have a linear transition from low to high may cause this code to set. Scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use the Quick Snapshot and the Purge/Seal functions to capture data while commanding purge to 20 percent, then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 while taking a snapshot.

Trouble Code: P0454

Fuel Tank Pressure (FTP) Sensor Intermittent

Possible Causes:

This diagnostic is designed to detect an unexpected abrupt voltage signal change from the FTP.

Scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To look at the sensor signal under vacuum conditions, use snapshot and the purge/seal function to capture data while commanding purge to 30 percent, and then plot the data to look for erratic sensor operation. A similar inspection can be done for the pressure side of the sensor range by applying pressure with the J 41413-200 while taking a snapshot.

Ensure that the reference port on the FTP sensor is unobstructed.

Trouble Code: P0454

Fuel Tank Pressure (FTP) Sensor Intermittent

Possible Causes:

P0451 and P0454

A restriction in the EVAP canister or vent lines could prevent fuel vapor pressure from bleeding off fast enough. If the vent system cannot bleed off pressure fast enough, the re-zero procedure may not complete successfully, which could cause this code to set.

Ensure that the reference port on the FTP sensor is unobstructed.

An FTP sensor that is skewed or does not have a linear transition from low to high may cause this code to set. Scan tool output controls, snapshot, and plot functions can help detect erratic sensor response. To test the sensor signal under vacuum conditions, use the Quick Snapshot and the Purge/Seal functions to capture data while commanding purge to 20 percent, then plot the data to look for erratic sensor operation. A similar test can be done for the pressure side of the sensor operation by applying pressure with the J 41413-200 while taking a snapshot.

Trouble Code: P0455

Evaporative Emission (EVAP) System Large Leak

Possible Causes:

A loose, missing, incorrect, or damaged fuel fill cap may cause this DTC to set.

To help locate intermittent leaks, use the J 41413-200 to introduce smoke into the EVAP system. Move all EVAP components while observing smoke with the J 41413-SPT . Introducing smoke in 15-second intervals will allow less pressure into the EVAP system. When the system is less pressurized, the smoke will sometimes escape in a more condensed manner.

To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the J 41413-SPT .

Trouble Code: P0461

Fuel Level Sensor Circuit Performance

Trouble Code: P0462

Fuel Level Sensor Circuit Low Voltage

Trouble Code: P0463

Fuel Level Sensor Circuit High Voltage

Trouble Code: P0464

Fuel Level Sensor Circuit Intermittent

Possible Causes:

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Trouble Code: P0464

Fuel Level Sensor Circuit Intermittent

Trouble Code: P0480

Cooling Fan Relay 1 Control Circuit

Possible Causes:

Review the Freeze/Failure Records vehicle mileage since the diagnostic test failed. This may help determine how often the condition that caused the DTC to be set occurs.

Trouble Code: P0480

Cooling Fan Relay 1 Control Circuit

Trouble Code: P0481

Cooling Fan Relay 2 Control Circuit

Possible Causes:

Review the Freeze/Failure Records vehicle mileage since the diagnostic test failed. This may help determine how often the condition that caused the DTC to be set occurs.

Trouble Code: P0481

Cooling Fan Relay 2 Control Circuit

Trouble Code: P0496

Evaporative Emission System Flow During Non-Purge

Trouble Code: P0506

Idle Speed Low

Trouble Code: P0507

Idle Speed High

Trouble Code: P0513

Theft Deterrent Key Incorrect

Possible Causes:

The "key" referenced in the DTC descriptor does not refer to the vehicle key. In this case, "key" is referring to the challenge response.